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Numéro de publicationUS4712574 A
Type de publicationOctroi
Numéro de demandeUS 06/041,401
Date de publication15 déc. 1987
Date de dépôt23 avr. 1987
Date de priorité23 avr. 1987
État de paiement des fraisPayé
Autre référence de publicationCA1278975C
Numéro de publication041401, 06041401, US 4712574 A, US 4712574A, US-A-4712574, US4712574 A, US4712574A
InventeursCharles H. Perrott
Cessionnaire d'origineC. H. Perrott, Inc.
Exporter la citationBiBTeX, EndNote, RefMan
Liens externes: USPTO, Cession USPTO, Espacenet
Vacuum-breaking valve for pressurized fluid lines
US 4712574 A
Résumé
For use in pressurized fluid lines, an anti-siphon and back-flow prevention valve. A conduit is tapped into the line upstream of an outlet terminating in a ball-shaped housing. The housing receives check valve means arranged for insuring that fluid does not escape during normal operation of the line, but for admitting vacuum-breaking air in the event of line pressure loss.
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Revendications(5)
I claim:
1. For use in a pressurized line delivering liquid to an outlet, a vacuum breaking valve for preventing backflow and siphoning comprising:
(a) a conduit adapted for tapping into the line upstream of the outlet,
(b) a housing having an open end connected to the conduit,
(c) the interior of the housing having an annular, outwardly facing shoulder,
(d) check valve means dimensioned for reception in the housing, seated against the shoulder, and
(e) retaining means position in the housing for releasably retaining the check valve means therein,
(f) the check valve means comprising,
(1) a perforated backup plate adapted for bearing engagement with the retaining means,
(2) a floating, centrally ported valve seat plate seated against the shoulder and bearing against the backup plate,
(3) a flexible, valve disc overlying the port in the valve seat plate in valving relation thereto, and
(4) centrally located interconnecting means interconnecting the backup plate and the valve disc, confining the valve seat plate in operative positions between them.
2. The valve of claim 2 wherein the interconnecting means comprises rivet means.
3. The valve of claim 2 wherein the retaining means comprises snap ring means.
4. The valve of claim 2 wherein the backup plate is concavely arcuate.
5. The valve of claim 1 wherein the housing is bell-shaped.
Description
BACKGROUND AND GENERAL STATEMENT OF THE INVENTION

This invention relates to vacuum-breaking valves for pressurized fluid lines.

Vacuum-breaking valves of the general type described herein are used widely in fluid supply systems to prevent back siphoning, or flow reversal whenever an operational variant causes a vacuum to be produced in the supply system. This is of particular importance in the case of Municpal Water Supply Systems which are subject to pressure variation. If the pressure in the supply system drops below atmospheric pressure, even momentarily, contaminating materials present in the house delivery system may be drawn into the main line with obviously disadvantageous results.

Such a situation may occur, for example, when water is supplied to mortuaries, hospitals, laboratories, laundries, chemical processing installations and the like. All of these may introduce serious sources of contamination into possible communication with the domestic tap water. Examples of such sources are the formaldehyde wash waters used for disinfecting kidney machines; mortuary fluids and wash waters; bacteriologically contaminated laboratory solutions; poisonous chemical solutions, etc.

No problem exists as long as normal pressure is maintained on the house line supplying water under pressure to the installation. However, in the event of failure of the pressurized water source, disconnecting the pressurized line for purposes of installation or repair or other occurrences, circumstances frequently arise wherein the pressure in the pressurized house line is reduced sharply. A vacuum may even be created. In such occurrences, contaminating fluids may be drawn into the system and subsequently discharged through the domestic tap.

It is the general purpose of the present invention to provide a vacuum-breaking valve for pressurized fluid lines which provides a solution to the above described problem.

It is a further object of the present invention to provide a vacuum-breaking valve which is simple in construction, efficient in operation, easily installed, adaptable for use in a wide variety of plumbing situations; and reliable and trouble-free in operation.

Broadly stated, the vacuum-breaking valve of my invention is adapted for use in a pressurized fluid line delivering liquid to an outlet. It includes a conduit adapted for tapping into the line upstream of the outlet.

A bell-shaped housing connects to the conduit and is mounted thereon, in inverted position. The interior of the housing has an annular, outwardly facing shoulder which provides a seat for check valve means dimensioned for reception in the housing.

A retainer is positioned in the housing for releasably retaining the check valve therein. As long as pressure is maintained in the fluid line, the check valve remains closed. However, if there is a serious drop in pressure in the line, the check valve opens, admitting air, breaking the vacuum, and preventing back-flow of contaminated materials into the system.

THE DRAWINGS

In the Drawings

FIG. 1 is a view in side elevation, partly in section, of the vacuum breaking valve of my invention in its use position.

FIG. 2 is an exploded, top perspective view of the valve.

FIGS. 3 and 4, are fragmentary, longitudinal, sectional views of the valve in operation, FIG. 3 showing the valve in its closed, pressurized position and FIG. 4 showing the valve in its open, vacuum-breaking position.

DESCRIPTION OF A PREFERRED EMBODIMENT

Referring to FIG. 1, the valve, indicated generally at 10, is illustrated connected to a pressurized fluid conduit or house line 12, and a delivery line 14 leading, for example, to an appliance which might be a source of contamination in the event of the development of vacuum in house line 12.

The valve assembly is connected to a conduit 16 adapted to be tapped into the house line just upstream from the outlet.

Referring to FIG. 2, the valve elements are housed in a bell-shaped housing 18 threaded onto the outer end of conduit 16. The interior of the housing is provided with an annular, outwardly facing shoulder 20 and, a spaced distance outwardly thereof, an annular groove 22.

The valve assembly includes an outwardly concave, perforated, backup plate 23, a floating, centrally ported valve seat plate 24, and a flexible valve disc 26. In the assembled condition, backup plate 23 is interconnected with valve disc 26 by means of a rivet 28 or other suitable interconnecting means.

The assembled check valve thus has the appearance illustrated in FIGS. 3 and 4. Valve seat plate 24 is confined by rivet 28 in operative position between backup plate 23 and valve disc 26.

Retaining means is provided for releasably retaining the valve assembly within housing 18. In the illustrated form of the invention, the retaining means comprises a snap ring 30 releasably seated in annular groove 22.

When assembled, backup plate 23 bears against retaining ring 30 and the margins of valve seat plate 24 are seated against shoulder 20. Both the valve seat plate 24 and valve disc 26 are fabricated from flexible materials such as natural or synthetic rubber, and accordingly conform to the inwardly concave, or bowed, structure of backup plate 23. As is especially evident in FIG. 3, this enables the assembly to withstand the substantial pressure exerted by the fluid present in the system.

The use positions of the check valve assembly are also illustrated in FIGS. 3 and 4.

In FIG. 3, the normal condition of the valve assembly is illustrated, closed against escape of pressurized fluid within the system.

FIG. 4 illustrates the open position of the valve, which occurs when a condition of reduced pressure is present within the system. When that occurs, atmospheric air passes through the perforations in backup plate 23, through the central opening in valve seat plate 24, and around the edges of the inwardly flexed valve disc 26. This breaks the vacuum and prevents the backflow of contaminating fluids present in delivery conduit 14 into the main line 12.

Having thus described in detail a preferred embodiment of the present invention, it will be apparent to those skilled in the art that various physical changes may be made in the device described herein without altering the inventive concepts and principles embodied. The present embodiment is therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims. All changes which come within the meaning and range of equivalency of the claims are therefore to be embraced therein.

Citations de brevets
Brevet cité Date de dépôt Date de publication Déposant Titre
US30849 *4 déc. 1860 Improvement in plows
US1755993 *16 août 192622 avr. 1930William C GroenigerWater-supply system
US2115499 *24 juil. 193626 avr. 1938Edward Q JacksonProtective device for systems of water supply
US2259984 *31 janv. 194021 oct. 1941Anderson Dwight MVacuum breaking valve
US2405639 *19 févr. 194413 août 1946Boosey Edward W NVacuum breaker
US2502211 *19 juin 194828 mars 1950Easy Washing Machine CorpVacuum breaker
US2686528 *6 févr. 195017 août 1954Backflow Engineering & EquipmeFluid pressure trip controlled vacuum breaker
US2738798 *14 déc. 195320 mars 1956Wrightway Engineering CoVacuum breaker
US2777464 *7 mars 195115 janv. 1957Detroit Controls CorpFlow control devices
US3145724 *14 nov. 196025 août 1964Harry KarpVacuum breaking device
US4022244 *14 déc. 197310 mai 1977Oman William SIrrigation purge valve
US4508136 *29 sept. 19822 avr. 1985Kah Jr Carl L CAnti-syphon flow control valve
Référencé par
Brevet citant Date de dépôt Date de publication Déposant Titre
US4974632 *27 nov. 19894 déc. 1990Ericson Kurt Sture BirgerAutomatic air valves for ducts
US5088689 *14 déc. 198918 févr. 1992Automatic Control Components, Inc.Removable discharge sleeve in a disk valve
US5192269 *24 juil. 19919 mars 1993Abbott LaboratoriesMulti-valve manifold for drug infusion systems
US5253670 *14 déc. 199219 oct. 1993C. H. Perrott, Inc.Multiple drain trap primer valve assembly for sewer lines
US5392769 *6 oct. 199228 févr. 1995Vinatroics DivisionOne-way valve
US5480030 *15 déc. 19932 janv. 1996New West Products, Inc.Reusable, evacuable enclosure for storage of clothing and the like
US5564457 *5 juin 199515 oct. 1996G & H Products Corp.Vacuum breaker valve with CIP capability
US5931189 *5 mai 19973 août 1999New West Products, Inc.One way valve for use with vacuum cleaner attachment
US5964241 *20 juin 199712 oct. 1999Tom King Harmony Products, Inc.Siphon freeze drain valve for underground irrigation systems
US6161564 *6 avr. 199919 déc. 2000Cornwall; Kenneth R.Fire transmission prevention system
US62028497 juil. 199920 mars 2001David B. GrahamEvacuatable rigid storage unit for storing compressible articles therein
US6267473 *30 avr. 199931 juil. 2001Hewlett-Packard CompanyCheck valve in an ink pump for an ink-jet printer
US627312425 mai 200014 août 2001Donald G. HuberCheck valve floor drain
US629322918 avr. 200025 sept. 2001Edstrom Industries, Inc.Cage flood prevention system
US640887212 mai 199925 juin 2002New West Products, Inc.Evacuable container having one-way valve with filter element
US657519130 avr. 200210 juin 2003Illinois Tool Works Inc.Evacuable container having one-way valve with filter element
US67015591 août 20019 mars 2004Aero Products International, Inc.Increased height inflatable support system
US671900425 juil. 200213 avr. 2004Donald G. HuberCheck valve floor drain
US683726824 févr. 20034 janv. 2005Illinois Tool Works Inc.Evacuable container having one-way valve with filter element
US698636016 mars 200417 janv. 2006Chaffee Robert BValve for inflatable objects
US702205821 févr. 20024 avr. 2006Tilia International, Inc.Method for preparing air channel-equipped film for use in vacuum package
US70871304 mars 20048 août 2006Tilia International, Inc.Method for manufacturing a sealable bag having an integrated zipper for use in vacuum packaging
US71380254 mars 200421 nov. 2006Tilia International, Inc.Method for manufacturing a sealable bag having an integrated tray for use in vacuum packaging
US722005314 déc. 200422 mai 2007Sunbeam Products, Inc.Flexible composite bag for vacuum sealing
US723757229 oct. 20043 juil. 2007Hewlett-Packard Development Company, L.P.Check valve
US739583516 févr. 20058 juil. 2008Rectorseal CorporationAir admittance valve
US747844822 déc. 200620 janv. 2009Aero Products International, Inc.Inflatable reinforcing chamber
US7500585 *26 juil. 200510 mars 2009Masatoshi MasudaFluid-storing container
US751748415 mars 200414 avr. 2009Sunbeam Products, Inc.Forming evacuation channels during single and multi-layer extrusion process
US753403919 juil. 200519 mai 2009Sunbeam Products, Inc.Vacuum packaging films patterned with protruding cavernous structures
US762545930 juin 20061 déc. 2009Sunbeam Products, Inc.Method for manufacturing liquid-trapping bag for use in vacuum packaging
US79381384 nov. 200510 mai 2011Robert B. ChaffeeValve for inflatable objects
US81620094 avr. 200724 avr. 2012Chaffee Robert BMethod and apparatus for monitoring and controlling pressure in an inflatable device
US82254446 janv. 200924 juil. 2012Chaffee Robert BInflatable device forming mattresses and cushions
US830784110 mai 201113 nov. 2012Chaffee Robert BValve for inflatable objects
US841327813 mars 20099 avr. 2013Robert B. ChaffeeMethod and apparatus for monitoring and controlling pressure in an inflatable device
WO1995016619A1 *14 déc. 199422 juin 1995New West Products IncReusable-evacuable enclosure
WO2006049712A1 *19 sept. 200511 mai 2006Hewlett Packard Development CoCheck valve
Classifications
Classification aux États-Unis137/217, 137/454.2, 137/854, 137/517
Classification internationaleF16K15/14, E03C1/10
Classification coopérativeF16K15/148, E03C1/10
Classification européenneF16K15/14J, E03C1/10
Événements juridiques
DateCodeÉvénementDescription
14 mai 1999FPAYFee payment
Year of fee payment: 12
21 févr. 1995FPAYFee payment
Year of fee payment: 8
9 mai 1991FPAYFee payment
Year of fee payment: 4
26 mai 1987ASAssignment
Owner name: C.H. PERROTT, INC., PORTLAND, OR., A CORP. OF OR.
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PERROTT, CHARLES H.;REEL/FRAME:004717/0942
Effective date: 19870518